2cokeman

I have been told by my dealer here that I can use 93 octane on my stock tune to stop the pinging and guess what? it does!! Can I harm the engine with the high octane?? My dealer checked the computer and I have the latest spark knock software already!!

howarmat

no

2cokeman

No it won't hurt or no I can't use it?

howarmat

no it wont hurt anything.

ohnoesaz

Can't a higher octane lead to, over time, carbon build up due to it not being burnt as well?

Thusly meaning it would only be ok with a 93 tune that is made to burn that type of fuel.

Mikes_BLK_GT

I dont know about the 05-07 mustangs but ingeneral using the stock tune with the higher octane doesnt really bu you anything except a fuel bill that explodes exponentialy.

howarmat

I have ran 93 in every car I have owned and never had any problems. I have put lower octance (87,89) in and the fuel grade is not as good and the cars dont run as well.

2007GT/CS

I disagree. My car ran just fine on 87 with the stock tune. It is designed to run on that octane and it's right there in the manual.

Your dealer has a problem they need to address with your car. You should not have to pay an extra .20 a gallon forever to fix their problem.

They need to try again.

howarmat

I do agree with that.....depending on environmental settings....you shouldnt have any pinging with the stock tune and if you do then they should do some adjusting somewhere.

drbobvs

+1. Your car should NOT ping!

Our cars are designed to run on 87 octane and they have built in knock sensors that will retard timing to compensate. There is either 1) definitely something wrong with your vehicle, 2) something wrong with the fuel your using, try switching stations 3) you're always driving in too high a gear, bogging the engine or 4)what you're hearing isn't pinging at all, perhaps something else?

Anyway, you're the first I've heard have pinging with a completely stock car.